/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/PartyBeaconClient.h
Response from the host session after making a cancellation request
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(Client, Reliable) virtual void ClientCancelReservationResponse ( [EPartyReservationResult::Type](API\Plugins\OnlineSubsystemUtils\EPartyReservationResult__Type) ReservationResponse )